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Cheap flights from Knoxville to Portugal from $504

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to Portugal departing on 1/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Knoxville to Portugal

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
7:44 am - 6:55 amTYS-LIS
18h 11m1 stop
Multiple Airlines Logo
6:30 am - 11:59 pmLIS-TYS
22h 29m2 stops
$504Multiple Airlines
Find Deal
Wed, Jan 7 - Sat, Jan 17
Multiple Airlines Logo
7:44 am - 6:55 amTYS-LIS
18h 11m1 stop
Multiple Airlines Logo
10:40 am - 8:56 pmLIS-TYS
15h 16m1 stop
$506Multiple Airlines
Find Deal
Wed, Jan 7 - Sat, Jan 17
Multiple Airlines Logo
6:00 am - 6:55 amTYS-LIS
19h 55m2 stops
Multiple Airlines Logo
6:30 am - 11:59 pmLIS-TYS
22h 29m2 stops
$509Multiple Airlines
Find Deal
Wed, Jan 7 - Sat, Jan 17
KLM Logo
6:00 pm - 5:10 pmTYS-FNC
42h 10m2 stops
KLM Logo
10:10 am - 9:38 amFNC-TYS
52h 28m2 stops
$558KLM
Find Deal
Wed, Dec 3 - Sun, Dec 7
United Airlines Logo
7:25 pm - 3:05 pmTYS-LIS
39h 40m2 stops
United Airlines Logo
5:05 am - 7:17 pmLIS-TYS
19h 12m2 stops
$567United Airlines
Find Deal
Sat, Mar 21 - Mon, Mar 30
British Airways Logo
6:50 pm - 10:30 pmTYS-LIS
23h 40m2 stops
British Airways Logo
11:05 am - 8:39 pmLIS-TYS
14h 34m1 stop
$652British Airways
Find Deal
Sat, Mar 21 - Mon, Mar 30
KLM Logo
6:00 pm - 5:10 pmTYS-FNC
42h 10m2 stops
KLM Logo
10:10 am - 11:28 pmFNC-TYS
42h 18m2 stops
$664KLM
Find Deal
Wed, Dec 3 - Sun, Dec 7
Lufthansa Logo
7:20 pm - 11:30 pmTYS-LIS
23h 10m2 stops
Lufthansa Logo
5:00 am - 9:04 pmLIS-TYS
21h 04m2 stops
$680Lufthansa
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Sat, Nov 29 - Sat, Dec 6
United Airlines Logo
7:25 pm - 8:10 amTYS-LIS
31h 45m2 stops
United Airlines Logo
5:00 am - 10:48 amLIS-TYS
33h 48m2 stops
$695United Airlines
Find Deal
Sat, Mar 7 - Sun, Mar 15
Lufthansa Logo
7:25 pm - 8:25 pmTYS-FNC
20h 00m2 stops
Lufthansa Logo
4:10 am - 7:29 pmFNC-TYS
20h 19m2 stops
$1,733Lufthansa
Find Deal
Wed, Dec 3 - Sat, Dec 6

United Airlines flights from Knoxville to Portugal

Our best United Airlines deals on Knoxville to Portugal flight tickets
United Airlines
Mar 21
TYS7:25 pmKnoxville McGhee Tyson
39h 40m
2 stops
LIS3:05 pmLisbon Humberto Delgado
Mar 30
LIS5:05 amLisbon Humberto Delgado
19h 12m
2 stops
TYS7:17 pmKnoxville McGhee Tyson
$567
Find similar
United Airlines
Mar 7
TYS7:25 pmKnoxville McGhee Tyson
31h 45m
2 stops
LIS8:10 amLisbon Humberto Delgado
Mar 15
LIS5:00 amLisbon Humberto Delgado
33h 48m
2 stops
TYS10:48 amKnoxville McGhee Tyson
$695
Find similar
United Airlines
Mar 7
TYS7:25 pmKnoxville McGhee Tyson
31h 45m
2 stops
LIS8:10 amLisbon Humberto Delgado
Mar 15
LIS12:15 pmLisbon Humberto Delgado
36h 39m
2 stops
TYS8:54 pmKnoxville McGhee Tyson
$708
Find similar

Lufthansa flights from Knoxville to Portugal

Our best Lufthansa deals on Knoxville to Portugal flight tickets
Lufthansa
Nov 29
TYS7:20 pmKnoxville McGhee Tyson
23h 10m
2 stops
LIS11:30 pmLisbon Humberto Delgado
Dec 6
LIS5:00 amLisbon Humberto Delgado
21h 04m
2 stops
TYS9:04 pmKnoxville McGhee Tyson
$680
Find similar
Lufthansa
Dec 3
TYS7:25 pmKnoxville McGhee Tyson
20h 00m
2 stops
FNC8:25 pmFunchal Madeira
Dec 6
FNC4:10 amFunchal Madeira
20h 19m
2 stops
TYS7:29 pmKnoxville McGhee Tyson
$1,733
Find similar
Lufthansa
Dec 29
TYS5:35 pmKnoxville McGhee Tyson
39h 55m
2 stops
FNC2:30 pmFunchal Madeira
Jan 7
FNC1:05 pmFunchal Madeira
59h 22m
2 stops
TYS7:27 pmKnoxville McGhee Tyson
$1,771
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Knoxville to Portugal that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated November 2, 2025.
Use the filters below to find and compare flights from Knoxville to Portugal that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Wed 1/7

7:44 am-6:55 am

1 stop18h 11m

Lisbon Humberto Delgado

Sat 1/17

6:30 am-11:59 pm

2 stops22h 29m

$504

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Wed 1/7

7:44 am-6:55 am

1 stop18h 11m

Lisbon Humberto Delgado

Sat 1/17

10:40 am-8:56 pm

1 stop15h 16m

$506

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Wed 1/7

6:00 am-6:55 am

2 stops19h 55m

Lisbon Humberto Delgado

Sat 1/17

6:30 am-11:59 pm

2 stops22h 29m

$509

KnoxvilleFunchal

TYS - FNC

TYSFNC

Knoxville McGhee Tyson

Wed 12/3

6:00 pm-5:10 pm

2 stops42h 10m

Funchal Madeira

Sun 12/7

10:10 am-9:38 am

2 stops52h 28m

$558

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 3/21

7:25 pm-3:05 pm

2 stops39h 40m

Lisbon Humberto Delgado

Mon 3/30

5:05 am-7:17 pm

2 stops19h 12m

$567

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 3/21

6:50 pm-10:30 pm

2 stops23h 40m

Lisbon Humberto Delgado

Mon 3/30

11:05 am-8:39 pm

1 stop14h 34m

$652

KnoxvilleFunchal

TYS - FNC

TYSFNC

Knoxville McGhee Tyson

Wed 12/3

6:00 pm-5:10 pm

2 stops42h 10m

Funchal Madeira

Sun 12/7

10:10 am-11:28 pm

2 stops42h 18m

$664

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 11/29

7:20 pm-11:30 pm

2 stops23h 10m

Lisbon Humberto Delgado

Sat 12/6

5:00 am-9:04 pm

2 stops21h 04m

$680

KnoxvilleLisbon

TYS - LIS

TYSLIS

Knoxville McGhee Tyson

Sat 3/7

7:25 pm-8:10 am

2 stops31h 45m

Lisbon Humberto Delgado

Sun 3/15

5:00 am-10:48 am

2 stops33h 48m

$695

KnoxvilleFunchal

TYS - FNC

TYSFNC

Knoxville McGhee Tyson

Wed 12/3

7:25 pm-8:25 pm

2 stops20h 00m

Funchal Madeira

Sat 12/6

4:10 am-7:29 pm

2 stops20h 19m

$1,733

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Portugal from

How to get the cheapest flight ticket from Knoxville to Portugal

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Portugal?

The cheapest month to fly to Portugal from Knoxville is in February. Flight prices, which tend to average around $638, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of February, then book flights to Portugal from Knoxville during January instead. Flights to Portugal in January, while not as cheap as those in February, still average around $669.

What is the cheapest day to depart on your flight to Portugal?

According to our data, Monday is the cheapest day to fly to Portugal from Knoxville. The lowest ticket price found for a Monday departure recently was $819. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. The most expensive day to fly to Portugal is Saturday, with ticket prices averaging around $1,534.

What is the cheapest time of day to depart on your flight to Portugal?

Our most recent data shows that the best time of day to fly to Portugal is in the morning. Flights from Knoxville to Portugal during this time can be as low as $745. In the afternoon is when there is more demand to fly to Portugal, so prices are often more expensive at around $1,134 per ticket.

Can stopping save me money on Knoxville to Portugal flights?

You could potentially save up to 9% on your flight if you consider stops on a Knoxville to Portugal flight.

Cheap Knoxville to Portugal flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Knoxville to Portugal

Direct flights

None
There are no direct flights from Knoxville to Portugal. There are no popular flight routes from Knoxville to Portugal.
Search flight deals

  • When did momondo last update prices for flights from Knoxville McGhee Tyson Airport to Portugal?

    Prices for flights from Knoxville McGhee Tyson Airport to Portugal were last updated today.

  • How many operators does momondo search for flights from Knoxville McGhee Tyson Airport to Portugal?

  • How old do you have to be to fly from Knoxville McGhee Tyson Airport to Portugal?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Knoxville McGhee Tyson Airport to Portugal.

  • What documentation or ID do you need to fly to Portugal?

    The travel and health documents required for your trip to Portugal can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Portugal. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Knoxville to Portugal

Compare and see reviews for airlines that fly from Knoxville to Portugal with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $602Free CancellationRating
7.2
11,033 reviews
Search American Airlines flights
British AirwaysPriceFrom $615Free CancellationRating
6.7
7,491 reviews
Search British Airways flights
United AirlinesPriceFrom $619Free CancellationRating
7.4
8,993 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Knoxville to Portugal?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Knoxville to Portugal. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Knoxville to Portugal with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Knoxville to Portugal flights to just show those with flexible booking policies.

How can momondo help me find flights from Knoxville to Portugal?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Portugal from Knoxville.

I’m not ready to book a flight from Knoxville to Portugal right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Knoxville to Portugal flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Find better results for your trip to Portugal

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